1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75afbb50ef3615d546536b5cf42d9e6966b5884327fb33fa357137e6b32848a6. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9bb1ca52-af18-444a-b768-d43ce1fd0505.json and https://artists.proofprofile.net/proofs/artist/9bb1ca52-af18-444a-b768-d43ce1fd0505.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ff23c5003a57ca2afd73dfee5c80f81d28931d2f183f7f34e42ecc7f8887d08. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZES82323801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x958b4747996808ca934f23350078402f158f2a0ae72995c16f7eaa76216ffa9f. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZPLR2376277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48fff4b2442efa7e9d3d2ac235a4ce5ca5090d3b052a7ad49daa3ca8a2f1c088. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTBE2302918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9c1cd1e3de7cc4fcf8b35a8c09de5d83f30c6695f76f83fdfa5178506a39c75. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFZ32463131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dabe9861abd64552ed8a6515bb828b7760a7f6cab16fa738966aae8e9b91f1c. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN92459314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d9f41056a2340a86a7c483679af4f598a04c7d287081f013456b103169711b8. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN92459322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e6e3a0beeb29c45f54941955fee96e42f141ceb5f0f2d2e1ced0a1e71341ffe. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN92459327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf153e07f6a4a714b2230874f7f6575611195aa1931ba5c10920429c6d451e967. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN92459329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9db8a82e193f2efe36d51e20825e9624aaa7ceb2bdd6b6367fd4cc484edb686. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZDA72576113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0429b2cfdca3768f806f19947bc223a39029181df8a7d7cf884742591d5c0d96. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZDA72576116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe537a2d733697cb05f104e6bdcd187148d66c20f83eae27106f03807fd22383e. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZDA72576117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d9bd6150c69150e06b1dd8a5cfc0edc1e43ffa38277f43a762ba3dda39c3f2e. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMER2503385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7bac975a34fe5e251dde898053914a342c363b57f29c16c640b4a8bff344e6e. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTAY2575094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1be1c00d1bc04a26abdcc0489a6b8367711b688f36a2e3e232175a149f9ef2f2. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTAY2423071.